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S. SWEET, 0. G. HOFFMANN 8u F. SANDBRSON. TYPE WRITING MACHINE. No. 427,637. i Patelyed May 13, 1890.

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- ||i||||||x|7|/I/|In|lij I ||||5 fvff ff 'f o /l n@ /4 @yf fyeczmI/Swdmm UNITED STATES PATENT EEIcE.,

STEPHEN SIVEET AND OTTO C. HOFFMANN, OF CHICAGO, AND FREDERICK SANDERSON, OF PROSPECT PARK., ILLINOIS; SAID SiVEET AND HOFF- MANN ASSIGNORS TO SAID SANDERSON.

TYPE-WRITING MACHINE.

SPECIFICATION forming part of Letters Patent No. 427,637, dated May 13,' 1890.

Application filed .Iuly 29, 1889. Serial No. 319,093. (No model.)

To all whom, t may concern.

Be it known that we, STEPHEN SWEET and OTTO C. IIOFFMANN,of Chicago, Cook county, Illinois, and FREDERICK SaNDERsoN,of lros- 5 peet Park, Du Page county, Illinois, have invented certain new and useful Improvements in 'lype-Writing Machines, of which the following.description, in connection with the accompanying drawings, is a specification, like ro numerals on the drawings representing like parts.

In the drawings, Figure 1 is a top plan view ot' our improved type-writing machine. Fig. 2 is a bottom plan view of the movable car- 15 riage detached trom the machine and partly broken away to show some of the operative parts. Fig. is a cross-section taken on the broken line 1 1 of Fig. 1. Fig. 4t is a detail front elevation of the central part of the mov 2o able carriage and stationary frame, partly broken away. Fig. 5 is a view of the linefeed device. Fig. (5 is an elevation of the lineieed roller. Fig. 7 is a detail bottom plan view of a part of the rubber type-segment.

25 Fig. S is a plan View of the pawl-lever and its spring.

The following is a description of the parts of the machine: 1 is the type-carrying segment; 2, a segmental piece of rubber secured 3o to segment 1 and having letters, figures, and

characters for printing formed on its under4 side; 3, an index-plate secured to the top of the movable carriage, and having marked upon its upper surface letters, &c., corresponding 3 5 te those on the rubber above described. The

lever 4 and the segmentl 1 are rigidly mounted on the post 5, which is j ournaledin a part of the frame on which the movable carriage is operated. This lever is made in two sections,

4o which are hinged together. Rigidlysecured to the lower side of the front section is the forked lever 7, which passes under acollar on the sleeve 8, loosely surrounding the post 5.

9 is a ratchet-bar rigidly secured lengthwise 4 5 in the frame which supports themovable carriage. rlwo collars 10 l0 encircle this, so as to slide upon it. A frame 11 is secured to these collars on their outer sides, and is rigidly secured to the sleeve S at its back. The

5o ratchet-wheel 12 is pivoted on the frame supporting the movable carriage, so as to engage with the ratchetebar. The coiled spring 13 is secured within this wheel to the wheel and its pivot. The pawl 14 is pivoted in one side of the frame 11,at the underside of the same, 5 5 at such a point that it will engage -with the wheel 12.

15 is a pawl. rigid with the frame 11 on its inner and upper edge, placed at a point back of pawl 1i a distance equal to the width of 6o one cog of wheel l2, so as to engage with wheel 12 whenever pawl let becomes disengaged.

17 is the pivot upon which pawl 14 is secured. A shortI lever 1G is rigidly secured to the top oi' said pivot and rests upon an arm 65 of frame 1l. A spring 18 is designed to actuate said lever. A tube 1S) is rigidly secured to the center of the frame 1l on its lower side.

It is formed with the slot 23 ending a little short of its lower end, and it contains `the 7o coiled spring 20. In its lower part the plunger 2l is inserted. This is retained by'its pin 22, extending through the slot.

The thumb piece of the line-feed 24E is formed with a groove running about its in! 75 ner face and with holes made in this groove at a distance from each other equal to the desired space between lines. The spring-dog 2.5 is secured at one end to the frame, so that it will drop into these holes as the fced-roll 8c is revolved, thus indicating` when the proper space has been described for another line.

The parallel index-bars 2G and 27 .are se cured, the former to the frame supporting the movable carriage, the latter to the lowest part 8 5 of the machine. A spring 28 acts upwardly upon the frame 11. The ink-pad 29 is formed with a slotl in the middle to permit the plunger to force the types down upon the paper one at a time, and it is secured beneath the 9o center ol;l the index-plate to the carriage. Oval holes 30 are made between the letters in the rubber typesegment` to increase the facility of the downward movementoi` the types. A tablet 31 is secured upon the bottom of the 95 machine to support the paper upon which printing is being done. The feed-roll is placed just above this.

The following is a description ol the opern ation of the machine: The sheet of paper is roo passed in beneath the line-feed roll till its edge is below the bar 27. It is then ready to receive impressions from the types. Now, placing the lever 4 above the desired letter on the index-plate, press down upon its front end. This action will depress the front end of frame 1l, and with it the tube 19 and the plunger 21, the latter being thus pressed down upon the rubber type-segment over the desired letter which it will print upon the paper. The same action will also raise the rear end of the frame l1. As shown above, frame 11 is fast on collars 10 l0, and is rigidly secured to sleeve 8. Forked lever 7 engages with the collar on sleeve 8, and is actuated by the movement of the front section of lever 4, the hinge in the latter being the common fulcrum of the two former; hence when the front end of the lever 4 is depressed the rear end ot the frame 11 is raised and its front end depressed. Thus the pawl 14 will be disengaged from the wheel 12 and lwill be thrown backward by the action of the spring 1S. The wheel will revolve by the action of the spring 13, but will be stopped by the pawl 15 as soon as it has turned through a space equal to the width of one cog. Thus a letter is printed and the carriage advanced a space and made ready for the printing ot' another letter by means of the single movement of the hand. Releasing the pressure on lever 4, frame 1l will be returned to its original position by the action of the spring 28, pawl l5 will be disengaged, and pawl 14 will engage with the next cog of Wheel12. Vhen a line is finished, the line-feed roll is turned by hand until the spring-dog 25, leaving the hole in which it has been resting, drops into the next hole.

1 The spring 20 is employed in the tube 19, so

. in corresponding scales.

. when, it is obvious, the desired letter can be printed in its proper place. A space is leftv blank on the type-segm ent equal to the proper space to be left between words, and the corresponding point is of course indicated on the index-plate, over which the lever 4 is to be brought and depressed whenever a word has been finished.

What we claim as new, and desire to secure by Letters Patent of the United States, is

1. In a type-writer, the combination of a printing-lever formed in two sections hinged to each other, a forked lever rigidly secured to the front section, the sleeve 8, formed with a collar and fitting loosely on the pivot 5, the frame 11, secured rigidly to said sleeve, the plunger 2l, and the sleeves 10 10 on the bar 9, substantially as and for the purpose stated.

2. In a type-writer, the combination of the frame l1, rigidly secured to the sleeve 8 and having its arms secured to the sleeves 10 10, the pawl 14, pivoted in an arm ot' frame l1, the lever 16, rigidly secured to the top of such pivot above said arm, wheel 12, ratchet-bar 9, the spring 18, secured so as to actuate said lever, and the pawl 15, integral with said arm,

substantially as and for the purposes stated.

3. In atype-writer, the ratchet-wheel 12, pivoted on the frame which supports the movable carriage, in combination with the ratchet-bar 9, the coiled spring 13, secured to said wheel Within the same and to its pivot, the pawls 14 and 15, frame 11, aud the iiat spring 28, secured beneath said wheel, so as to act upon the arms of frame 11, substantially as and for the purposes stated.

4. In a typewriter, the combination of the printing-lever 4, the type-.bearing segment 1, the index-plate 3, frame l1, the tube 19, secured to the lower side of the said frame at its center line and formed with a slot extending nearly to its lower end, the coiled spring contained in said tube, and the plunger 21, inserted in the lower end of said tube and secured therein by its pin extending through the said slot, substantially as and for the purposes stated.

STEPHEN SWEET.

OTTO O. HOFFMANN. FREDERICK SANDERSON.

Witnesses: 1

W. O. CORLIEs, E. C. CRAWFORD. 

